/*
 * Treeview 1.5pre - jQuery plugin to hide and show branches of a tree
 *
 * http://bassistance.de/jquery-plugins/jquery-plugin-treeview/
 * http://docs.jquery.com/Plugins/Treeview
 *
 * Copyright (c) 2007 Jörn Zaefferer
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * Revision: $Id: jquery.treeview.js 5759 2008-07-01 07:50:28Z joern.zaefferer $
 *
 */

;(function($) {

    // TODO rewrite as a widget, removing all the extra plugins
    $.extend($.fn, {
    swapClass: function(c1, c2) {
    var c1Elements = this.filter('.' + c1);
    this.filter('.' + c2).removeClass(c2).addClass(c1);
    c1Elements.removeClass(c1).addClass(c2);
    return this;
    },
    replaceClass: function(c1, c2) {
    return this.filter('.' + c1).removeClass(c1).addClass(c2).end();
    },
    hoverClass: function(className) {
    className = className || "hover";
    return this.hover(function() {
    $(this).addClass(className);
    }, function() {
    $(this).removeClass(className);
    });
    },
    heightToggle: function(animated, callback) {
    animated ?
    this.animate({ height: "toggle" }, animated, callback) :
    this.each(function(){
    jQuery(this)[ jQuery(this).is(":hidden") ? "show" : "hide" ]();
    if(callback)
    callback.apply(this, arguments);
    });
    },
    heightHide: function(animated, callback) {
    if (animated) {
    this.animate({ height: "hide" }, animated, callback);
    } else {
    this.hide();
    if (callback)
    this.each(callback);
    }
    },
    prepareBranches: function(settings) {
    if (!settings.prerendered) {
    // mark last tree items
    this.filter(":last-child:not(ul)").addClass(CLASSES.last);
    // collapse whole tree, or only those marked as closed, anyway except those marked as open
    this.filter((settings.collapsed ? "" : "." + CLASSES.closed) + ":not(." + CLASSES.open + ")").find(">ul").hide();
    }
    // return all items with sublists
    return this.filter(":has(>ul)");
    },
    applyClasses: function(settings, toggler) {
    // TODO use event delegation
    this.filter(":has(>ul):not(:has(>a))").find(">span").unbind("click.treeview").bind("click.treeview", function(event) {
    // don't handle click events on children, eg. checkboxes
    if ( this == event.target )
    toggler.apply($(this).next());
    }).add( $("a", this) ).hoverClass();

    if (!settings.prerendered) {
    // handle closed ones first
    this.filter(":has(>ul:hidden)")
    .addClass(CLASSES.expandable)
    .replaceClass(CLASSES.last, CLASSES.lastExpandable);

    // handle open ones
    this.not(":has(>ul:hidden)")
    .addClass(CLASSES.collapsable)
    .replaceClass(CLASSES.last, CLASSES.lastCollapsable);

                // create hitarea if not present
    var hitarea = this.find("div." + CLASSES.hitarea);
    if (!hitarea.length)
    hitarea = this.prepend("<div class=\"" + CLASSES.hitarea + "\"/>").find("div." + CLASSES.hitarea);
    hitarea.removeClass().addClass(CLASSES.hitarea).each(function() {
    var classes = "";
    $.each($(this).parent().attr("class").split(" "), function() {
    classes += this + "-hitarea ";
    });
    $(this).addClass( classes );
    })
    }

    // apply event to hitarea
    this.find("div." + CLASSES.hitarea).click( toggler );
    },
    treeview: function(settings) {

    settings = $.extend({
    cookieId: "treeview"
    }, settings);

    if ( settings.toggle ) {
    var callback = settings.toggle;
    settings.toggle = function() {
    return callback.apply($(this).parent()[0], arguments);
    };
    }

    // factory for treecontroller
    function treeController(tree, control) {
    // factory for click handlers
    function handler(filter) {
    return function() {
    // reuse toggle event handler, applying the elements to toggle
    // start searching for all hitareas
    toggler.apply( $("div." + CLASSES.hitarea, tree).filter(function() {
    // for plain toggle, no filter is provided, otherwise we need to check the parent element
    return filter ? $(this).parent("." + filter).length : true;
    }) );
    return false;
    };
    }
    // click on first element to collapse tree
    $("a:eq(0)", control).click( handler(CLASSES.collapsable) );
    // click on second to expand tree
    $("a:eq(1)", control).click( handler(CLASSES.expandable) );
    // click on third to toggle tree
    $("a:eq(2)", control).click( handler() );
    }

    // handle toggle event
    function toggler() {
    $(this)
    .parent()
    // swap classes for hitarea
    .find(">.hitarea")
    .swapClass( CLASSES.collapsableHitarea, CLASSES.expandableHitarea )
    .swapClass( CLASSES.lastCollapsableHitarea, CLASSES.lastExpandableHitarea )
    .end()
    // swap classes for parent li
    .swapClass( CLASSES.collapsable, CLASSES.expandable )
    .swapClass( CLASSES.lastCollapsable, CLASSES.lastExpandable )
    // find child lists
    .find( ">ul" )
    // toggle them
    .heightToggle( settings.animated, settings.toggle );
    if ( settings.unique ) {
    $(this).parent()
    .siblings()
    // swap classes for hitarea
    .find(">.hitarea")
    .replaceClass( CLASSES.collapsableHitarea, CLASSES.expandableHitarea )
    .replaceClass( CLASSES.lastCollapsableHitarea, CLASSES.lastExpandableHitarea )
    .end()
    .replaceClass( CLASSES.collapsable, CLASSES.expandable )
    .replaceClass( CLASSES.lastCollapsable, CLASSES.lastExpandable )
    .find( ">ul" )
    .heightHide( settings.animated, settings.toggle );
    }
    }
    this.data("toggler", toggler);

    function serialize() {
    function binary(arg) {
    return arg ? 1 : 0;
    }
    var data = [];
    branches.each(function(i, e) {
    data[i] = $(e).is(":has(>ul:visible)") ? 1 : 0;
    });
    $.cookie(settings.cookieId, data.join(""), settings.cookieOptions );
    }

    function deserialize() {
    var stored = $.cookie(settings.cookieId);
    if ( stored ) {
    var data = stored.split("");
    branches.each(function(i, e) {
    $(e).find(">ul")[ parseInt(data[i]) ? "show" : "hide" ]();
    });
    }
    }

    // add treeview class to activate styles
    this.addClass("treeview");

    // prepare branches and find all tree items with child lists
    var branches = this.find("li").prepareBranches(settings);

    switch(settings.persist) {
    case "cookie":
    var toggleCallback = settings.toggle;
    settings.toggle = function() {
    serialize();
    if (toggleCallback) {
    toggleCallback.apply(this, arguments);
    }
    };
    deserialize();
    break;
    case "location":
    var current = this.find("a").filter(function() {
    return this.href.toLowerCase() == location.href.toLowerCase();
    });
    if ( current.length ) {
    // TODO update the open/closed classes
    var items = current.addClass("selected").parents("ul, li").add( current.next() ).show();
    if (settings.prerendered) {
    // if prerendered is on, replicate the basic class swapping
    items.filter("li")
    .swapClass( CLASSES.collapsable, CLASSES.expandable )
    .swapClass( CLASSES.lastCollapsable, CLASSES.lastExpandable )
    .find(">.hitarea")
    .swapClass( CLASSES.collapsableHitarea, CLASSES.expandableHitarea )
    .swapClass( CLASSES.lastCollapsableHitarea, CLASSES.lastExpandableHitarea );
    }
    }
    break;
    }

    branches.applyClasses(settings, toggler);

    // if control option is set, create the treecontroller and show it
    if ( settings.control ) {
    treeController(this, settings.control);
    $(settings.control).show();
    }

    return this;
    }
    });

    // classes used by the plugin
    // need to be styled via external stylesheet, see first example
    $.treeview = {};
    var CLASSES = ($.treeview.classes = {
    open: "open",
    closed: "closed",
    expandable: "expandable",
    expandableHitarea: "expandable-hitarea",
    lastExpandableHitarea: "lastExpandable-hitarea",
    collapsable: "collapsable",
    collapsableHitarea: "collapsable-hitarea",
    lastCollapsableHitarea: "lastCollapsable-hitarea",
    lastCollapsable: "lastCollapsable",
    lastExpandable: "lastExpandable",
    last: "last",
    hitarea: "hitarea"
    });

})(jQuery);